Ribbit, ribbit, ribbit! Thank your lucky stars you met me! I'll ribbit you with some new power!
There's a story in Elgaia about a frog with a voracious appetite matched by its younger brother. In the younger brother's quest for the throne, it tried obtaining knowledge about every weapon in the world. However, it never had a chance to use this knowledge against its brother, for every other being in the world was after its power. Legend has it that the elder of the two had the ability to wield two spheres at once.
Trivia, Additional Information & Notes
When fused to a unit, it adds a 2nd sphere slot to that unit.
The spheres equipped to a unit must be of different types. (i.e. 2 Status Boost spheres can't be equipped at the same time)
If a unit is evolved with a sphere frog's effect on it, the sphere frog's effect will not be lost.